:sig
StringList DValue::keys() const

:params
return value : child keys for map/list values; empty for scalars

:see
>types
0_DValue
2_DValue_each
0_StringList

:content
Returns the keys produced by `each()`. Scalar values have no child key, so the result is empty. List-shaped values return their numeric keys as strings.

:example
DValue user;
user["name"] = "Ada";
user["role"] = "admin";
print(join(user.keys().sort(), ","), "\n");